How to convince my mom to tet me get my nose pierced?

ok so i am 12 and i want my nose pierced really badly and my dad said that i can get all the holes in my boby as i want because they will close but no tattoos how can i convince my mom to let me and all she says that i am too young i also told her if she doesnt let me get it done by a pro i will do it myself and i tried to tell her that you can get a invecton and end up in the emergency room and i showd stories of them to but she doesnt think that i will do but trust me i will i dont care if i end up there she has to pay for it so what ever help